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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f92a1d20baa30dfc8bb349f9c6f26554af12fd41f5ba8a16be362d9c6b3596b' 
  AND token = 'er3CBCJtBf7Goqd8suxEEkdny6xAUczwvVfirrUmbB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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