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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee2477619530b1d66e1b870d637f4a9ea7942ba53c3f1b20808ee2c94d27081d' 
  AND token = 'EHAz0DBEhOI98N5CmSCFW5kut49vHu0nAysf1oroghE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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