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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09b532bf42087574ac8b4e4d8205b3335900eb0917b512806aed28669ce09bcb' 
  AND token = '9gKL01bqjHdZZeZG++o9VQo8nD4RrNC3n2C1eYPvpVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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