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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b18ada724a04ae4d94dc0a13fc8d86a7ddf5d4ddec1acb3b11474ae4502eaa5' 
  AND token = 'viV9fu9mgFHAAuzLYsRKAxjef9VvruaiPFdQnZla75A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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