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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaa4acc8916170581d2e9a68fbe6c52606feecc3c45158bd924b8636cc5f9dfa' 
  AND token = 'bYa7cVvmPAgNAF9yK/7LL2IhnelARi/TuYxTR4Om53M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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