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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77e1b7ebf65139e2ff542832ebd02f1a6c5a83a3287338d0139c0b1b7195f12a' 
  AND token = 'jbqCbt9xLOSHF6xnGVwcM1Dv8z69NEjud1ZFOiL7YKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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