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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bfc300ca97c398b9232e258fdc7de2c7d5820f3adfc0f8dda01f7c1ba4db47b' 
  AND token = 'zvJ0Dvv7x7b78sdEIj3fFzsRq7AGinim/oPIjQD4hGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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