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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92b4905a1c714097000d2e011e37506e9cbd52d37f291e7825d867955a085e1a' 
  AND token = '1fp303xxvNxM2DeOYoW6ligZh4qVIthuu9SKHVmqD/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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