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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81fba712b299fb913fee8dd956f514fe0e42ade380320949f7e4dd0c4a82fe1e' 
  AND token = '61f4VOd9eesoVLEWQN6V+UCkUfjAV/lBS/AYYPJiABU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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