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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc7b4c558835af38215c20862936f320604d1930d29f6ef6d8613fa31d8cc08f' 
  AND token = 'Hajy/Zo1TX0b8wX2pRXV41QPiyJio+HSA2eZ2vsSikE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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