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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46058561fa8d5c8f8b56ac97953a224998e485d0ead515c83bb8d38f6ada3a55' 
  AND token = '34R1h3FBWZmEmuXUJ/ZGkEeVycLmkanmQ4nFKXU7L4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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