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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd682c60cfc846f11903a2dfe297be0f1137acf74dc5401c50a0ea2218022737' 
  AND token = 'wGOonvAM8g236gHRRrskP/JavlfV2VbR7wAL6bhGOX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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