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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '345f46d21894795fd45430cb444cfb7e35321d82f02fee1a41b04b9dcc8e27bb' 
  AND token = 'ov/LQrDrDFp13166utj2MVSdT3YTtaZtgVCpJ+kCd3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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