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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f01fcc3c04d008d953889c7cf83ab8e7f674e1cd91d39130df0c7d92b5e4a772' 
  AND token = 'h5YmTkWKhdMfLd9AwK4GZ0n4PSyb3yMk43dAmzIriTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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