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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b357f3280041dbdb4e825750c80ed31138033061b96eb22e6ccd64415a3e10' 
  AND token = 'ETa6cDzApEQqSWdMlKt5/+Jec+0I0OFxNeViRzNivCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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