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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b1029e952547ecaf394df5b2b21dfbaaf792d23771f9f0a56292ac930503bdb' 
  AND token = 'Rt+xwtByX8eO5AnzqLsAbnm1uTZE0qn65Tw1eB6vWok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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