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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da74de247232faedd7c424df5f492ee9ca21ebeb93aefaebe9f54f4c592d1bc1' 
  AND token = 'nsF+y/sP0g+g6pbO3iIwYdX/OA+ogPCkmU5Tch8KCh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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