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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86140f4ad713d38317953be8dd9235daa84aeff199bd12cfcdfe7f8dc981a471' 
  AND token = '/6A3pkFU91v2SE5u6RHVIo5AtdFmjQtEviG3KjqzqbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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