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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13e55c27c2a2e668b77db8da8568b4dcbf68d3ca1e90f447a3d3f5e4df58fded' 
  AND token = 'LgcrD2XTo3eVWhh3El2AwrcBlzlpfvSx49W1727OgEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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