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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68e2cefb87ab3d168587cc5e9497b1d0f0cf1ef100bbee3e91753f90458b6efe' 
  AND token = 'pz6jwB27n1cMVEYzqxMTLc7wm9CzMPKOFm/qZ/ZCcb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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