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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3fa52a8a325bccb1c3674becf68862bf95c2fd31634ba8cd49f5bf455588034' 
  AND token = '2/ddstUKSLGb3r2Ml3SsNePyxicbNPAYk+xbrUV0//A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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