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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b3e25f3ba29e1a9b39844edbb25217a2409863093141f1a1f3da48ecf0508c' 
  AND token = 'U1n0BvIlAEK0NP9Rxu8E6OJgVjkKLoVYZMzw90KkEgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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