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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '089e53cf8d4ec4ec62d778f81f99bbb62f4acefcfb9ae8cf9fc38b301407ec77' 
  AND token = 'd73Ke1gX/OBrPYR068x21As+lIsu1+Fx9BHdO+bsgNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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