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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86aa100f2c6d02eaa9ed0f7bc5ef470a5d47b333dc0d097d9bbf480fb3a6639a' 
  AND token = '0bKVabZyzE+BunOXRlI/RgXDvNVNBjMQ86onQzo2OWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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