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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbe5d0f6c7ea1f225eeeb3456b0ef3e2809461d7ca9f3787e8f9b415064e9852' 
  AND token = 'oS8uKVrhxChTSBqY7r+46lEdrMw0ON0aE1UJzaEiBIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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