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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c5e4827a07192c404390df5ee5b87c497d629a08df6eefc40ce86e016764aac' 
  AND token = 'CpyJtiQZt0wX6Hsqpo3Wc+pToe3OgjyKgI+hpcmER/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00114

JSON explain

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