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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1eed80df47159c419dac1065682e67338fd0a68cdd9cb6c773afa9df30588ef' 
  AND token = 'UR5HLAOzWpOReS/nlsmPj3VtLQFLMX1u6hCusDBty8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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