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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6707d5312c687df87f7342a17c3e94d821c77abb6d113cf5734720ad1746712' 
  AND token = 'tQddajJF1ocu6ramdP+KAwoP+HTvvq1i+yRwAR1EAxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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