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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de94f9633ee13df152d7e000e905d8eb034fd73ea1b76158e87f209330ce297e' 
  AND token = 'PR9TY5qPwA/oETcHD/ilAYNkJx+0kD2vRmAWL3DUYI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}