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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9477e65d30403aa03fcca5fd8bce55687ff33265422724177386b03ff7092e8' 
  AND token = '/LFPUGBmga2b6BK5JNy0hwg5xxsp6RPuVNMsIr/sAAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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