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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46d7350fa4321647d84aafb84a95d9f123d51d51871a410d3c7f94489fdb7831' 
  AND token = '6K80DNNbvFpwM9WIkkA8Kb/0xegZyoVC5U1jmZ+0M94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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