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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68bc152f362d1d42fea6ef32dad1bf9d718b44d0e3bd93d7e036287d864fe294' 
  AND token = 'aiJuIaB67FxZbPPC8Yf4DGDnW2FcQhvL6AfUUc3E+CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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