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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ba511d50742923d12cc8ab299cbb3cb9f2ebcd158c2c59d44d7cf23b38f644f' 
  AND token = 'uYXZ4yiAoLJXK5FcWC+68R6MbKpavM6XbD5YYovyD+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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