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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fef0fe449062c443be68cc81ab887386e94bb2103ba9b1f14c071a8d9aa3d88' 
  AND token = 'YmqmBI6SlKkfzPUIf5FmUikngQuEiQMsuLiXPELuHdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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