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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74e8925badcefd29a5c57be7f1475bfb8d4587502873aaf8eca00f413d064e8d' 
  AND token = 'W+v2f25wAlYipX/vaQ/qm85ST52A2SdYiIIIk0+s1C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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