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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc7a4047d2cc24018b4b7fa315278f7c681391acefdc29e13a9e79030c4298d2' 
  AND token = '+y98DhN6iOAM9PAJCytzqRM+kRxENwsYArgtwfUk7OU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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