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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5632d07df278d028bcbd72412ea9e511f3777cca7ab8161a100c78f33347c0a' 
  AND token = 'kYL/rkBp7aCo/mXb/PQ/IZsBERVozcZXAKyR4opIcyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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