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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f660e0bd2e2a405fa1fa4c8e8ac22131b177b7c93bb5bf788e2920a0434ce252' 
  AND token = 'KnKInXDkO4Ak0/oWIBrKCGhr8X1caEqoTmNWMjzF/Ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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