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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44bf8c94175de5232990f042541e038bb006a17b78f1d7863bac2c4c87c348d7' 
  AND token = 'DMvnu6q03HgyWEU+oe6SRJGMqvR+dOQlmwWWtrlT0Gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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