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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00d258a6cd764df6cf1f2888621595b9da41372b85c4abd9d47139644e47d389' 
  AND token = 'kdYMm6eeaNKhyd1JlfUEUk/NySb4goRKCT3H4GBT120=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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