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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03400faef629290653682914fda325a3b2c368f5af3eb3a7851ff32b87cac060' 
  AND token = 'sugT7NnXnXD2209SGQN5/pEZvdjS6wX1AFtY8i0UE4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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