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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d0745a87622c3d014f232737823052bb511eaaf06dda314e82a379c2257b0a' 
  AND token = 'XuQDA/UvWj4X4ra6f2WouoYeLanf73r5j6jWXlpVOrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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