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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '024eaa42947510a55f2d771ce91172ec68fc33f1e4ab13b24a714244d4c3bd06' 
  AND token = '6iQLO2pnS3K+4UQeShKLO8kLrhHL7jET4w9yrMIyyG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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