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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '502568cc1b380cb003192ea1eb44826210ad2ff985727b89e5683d6f7f1ba2e3' 
  AND token = '73RbI+cFIfyIMDd3la8jp3+gANaKekL2NWJ5hYGIsx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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