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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06c77f753af1471ceedd1cfdd3921e429e89cbf65aa922460dda8a9c18f18c3e' 
  AND token = 'HWkbkSpXY3BI80GqBps8e/vJbIjoAHo1PBmN3uQdVqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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