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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99b2b0d257f74fa3ee2737241ed271981f37c4366ec453434702d818150aff68' 
  AND token = 'U0i7lrauj7gL5gg3TP4c1RHD21sLqNgEMNrz966yxW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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