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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fe1ee6478ed80d031696f9a68cf1568c2ca9eda1600f1d3ccf5069c1cf4338c' 
  AND token = 'DK99kvarTwUIaJCIzJH+fNFOxljXvde3rVm3qKMWFUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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