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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcf9f92ee6da0ca5d4b34d30e0e058c90b859af7463e5e79e71250669dde0523' 
  AND token = 'j4v9PTzYocmL0qbIt7Ayrq33iCRDh5KRQLNpCf+C9+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00098

JSON explain

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