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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3b074d44bdbd02bd3084821381b2783ba863215ac17160e8640eaa28ef57033' 
  AND token = '/nGqM2799lEbxxBAnbSemw4KLtF4iyLY8aXrJ6/V65M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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