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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8028823e617cec37ad26d13dce5200adeff9ecdf25629097460761afab57b23' 
  AND token = '7A16TC7YDFECKTQyLHwXQS1F+Adnm6QFWM8q+cAwr2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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