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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb4b5c2b855bc7bfa7b67b414876900a76d6ccd80bb0b055025642c4825e24c6' 
  AND token = 'GZnPLpNYdFgPg2z3V0DzKs8NvWvexW9YmxzpHnICSKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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