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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e4b2ec9f909f266da521152574743e6cd448d607958a01285a2ee709dc8886' 
  AND token = 's6AIaltB6yTGOhhVCHyGgn5HhsVnhdHVrf3H6f7/Th4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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