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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51574fba297b3b402a347321b6b8184ce62c23528b5026c8f2e67331a3c745cb' 
  AND token = 'mntDhqfzSrWPeyBGLxfkeFSR2u9iqoH11s/Mz7VbHJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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